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DOUGs Web Site
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Date: 2-25-2019
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: Debugging steering & rudder movement
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Without the steering pushrods connected, the extension springs return the rudder pedals. When connected to the steering push rods they do not.
I measured the force of the 6" inch extension springs when installed (8" or 2" displacement) and its about 12 lbs when centered. I then measured the force to depress the rudder pedals with the steering gear attached and its about 20-24 lbs at full deflection.
I estimate about 5.5 lb spring rate, so at full deflection I think the springs are underpowered by about 3 - 6 lbs.
The nose gear appears to have reasonable friction, but according the notes on rigging the aircraft, the nose gear "must turn freely, if not then ream the two split bushings." So I will try that next. My back up plan is a stronger spring.
Also, when the pedals and rudder are centered, the left (pilot's side) push rod needs to be about 5 or 6mm shorter than the other side, and bottoms out at or before centering the wheel. I looked at the rudder pedal geometry, and the left side is closer to the firewall than the right side. So, it looks like I will be shortening the left tube a second time.
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springs do not return rudder pedals
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measuring force of rudder movement
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bushings on nose gear
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